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#1 The radius of Na+ is 95 pm and that of Cl– is 181 pm. The coordination number of Na+ is

6

Unpredictable

4

8

#2 Compounds with identical crystal structure and analogous chemical formula are called

Isotones

Isomorphous

Allotropes

Isomers

#3 Which among the following will show anisotropy?

Glass

Plastic

Barium chloride

Wood

#4 For an ionic crystal of the general formula AX and coordination number 6, the value of radius ratio will be

Less than 0.225

In between 0.732 and 0.414

Greater than 0.732

In between 0.414 and 0.225

#5 Copper crystallizes in fcc with a unit cell length of 361 pm. What is the radius of copper atom?

181 pm

127 pm

157 pm

108 pm

#6 In a metallic crystal

None of the above

The valence electrons are localized in between the kernels

The valence electrons remain within the field of influence of their own kernels

The valence electrons constitute a sea of mobile electrons

#7 The three dimensional graph of lattice points which sets the pattern for the whole lattice is called

Crystal lattice

Unit cell

Space lattice

Simple lattice

#8 The edge of unit cell of fcc Xe crystal is 620 pm. The radius of Xe atom is

189.37 pm

209.87

219.25 pm

235.16

#9 If the pressure on a NaCl structure is increased, then its coordination number will

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